I wanted the developer (since I'm going to mass release this) to be able to use controlsource to specify the field, since that is the most intuitively obvious control to hold the field name. Plus, it would be nice to be able to specify this as the default object type for numeric fields, so when you are dragging and dropping from the data environment it will populate automatically.

I think all I have to worry about are the programatic and interactive change events, but I was worried there might be other places.

I think I'll need to check stuff out in the init of the control, so that I make sure of the data type and stuff like that.

>We did something similar but with a date time fields to split up date hours, etc. We added a property which held the control source.
>
>Use the lost focus to save your new value.